1 /* $Id: muxmp4.c,v 1.24 2005/11/04 13:09:41 titer Exp $
3 This file is part of the HandBrake source code.
4 Homepage: <http://handbrake.fr/>.
5 It may be used under the terms of the GNU General Public License. */
12 void AddIPodUUID(MP4FileHandle, MP4TrackId);
14 struct hb_mux_object_s
23 /* Cumulated durations so far, in output & input timescale units (see MP4Mux) */
24 int64_t sum_dur; // duration in output timescale units
25 int64_t sum_dur_in; // duration in input 90KHz timescale units
27 // bias to keep render offsets in ctts atom positive (set up by encx264)
30 /* Chapter state information for muxing */
31 MP4TrackId chapter_track;
33 uint64_t chapter_duration;
35 /* Sample rate of the first audio track.
36 * Used for the timescale
46 struct hb_text_sample_s
53 /**********************************************************************
55 **********************************************************************
56 * Creates a buffer for a text track sample
57 *********************************************************************/
58 static struct hb_text_sample_s *MP4CreateTextSample( char *textString, uint64_t duration )
60 struct hb_text_sample_s *sample = NULL;
61 int stringLength = strlen(textString);
64 if( stringLength < 1024 )
66 sample = malloc( sizeof( struct hb_text_sample_s ) );
68 //textLength = (stringLength; // Account for BOM
69 sample->length = stringLength + 2 + 12; // Account for text length code and other marker
70 sample->duration = (MP4Duration)duration;
72 // 2-byte length marker
73 sample->sample[0] = (stringLength >> 8) & 0xff;
74 sample->sample[1] = stringLength & 0xff;
76 strncpy( (char *)&(sample->sample[2]), textString, stringLength );
80 // Modifier Length Marker
81 sample->sample[x] = 0x00;
82 sample->sample[x+1] = 0x00;
83 sample->sample[x+2] = 0x00;
84 sample->sample[x+3] = 0x0C;
87 sample->sample[x+4] = 'e';
88 sample->sample[x+5] = 'n';
89 sample->sample[x+6] = 'c';
90 sample->sample[x+7] = 'd';
93 sample->sample[x+8] = 0x00;
94 sample->sample[x+9] = 0x00;
95 sample->sample[x+10] = (256 >> 8) & 0xff;
96 sample->sample[x+11] = 256 & 0xff;
102 /**********************************************************************
103 * MP4GenerateChapterSample
104 **********************************************************************
105 * Creates a buffer for a text track sample
106 *********************************************************************/
107 static struct hb_text_sample_s *MP4GenerateChapterSample( hb_mux_object_t * m,
111 // We substract 1 from the chapter number because the chapters start at
112 // 1 but our name array starts at 0. We substract another 1 because we're
113 // writing the text of the previous chapter mark (when we get the start
114 // of chapter 2 we know the duration of chapter 1 & can write its mark).
115 hb_chapter_t *chapter_data = hb_list_item( m->job->title->list_chapter,
117 char tmp_buffer[1024];
118 char *string = tmp_buffer;
120 tmp_buffer[0] = '\0';
122 if( chapter_data != NULL )
124 string = chapter_data->title;
127 if( strlen(string) == 0 || strlen(string) >= 1024 )
129 snprintf( tmp_buffer, 1023, "Chapter %03i", chapter - 2 );
133 return MP4CreateTextSample( string, duration );
137 /**********************************************************************
139 **********************************************************************
140 * Allocates hb_mux_data_t structures, create file and write headers
141 *********************************************************************/
142 static int MP4Init( hb_mux_object_t * m )
144 hb_job_t * job = m->job;
145 hb_title_t * title = job->title;
148 hb_mux_data_t * mux_data;
150 uint16_t language_code;
152 /* Flags for enabling/disabling tracks in an MP4. */
153 typedef enum { TRACK_DISABLED = 0x0, TRACK_ENABLED = 0x1, TRACK_IN_MOVIE = 0x2, TRACK_IN_PREVIEW = 0x4, TRACK_IN_POSTER = 0x8} track_header_flags;
155 if( (audio = hb_list_item(title->list_audio, 0)) != NULL )
157 /* Need the sample rate of the first audio track to use as the timescale. */
158 m->samplerate = audio->config.out.samplerate;
163 m->samplerate = 90000;
166 /* Create an empty mp4 file */
167 if (job->largeFileSize)
168 /* Use 64-bit MP4 file */
170 m->file = MP4Create( job->file, MP4_DETAILS_ERROR, MP4_CREATE_64BIT_DATA );
171 hb_deep_log( 2, "muxmp4: using 64-bit MP4 formatting.");
174 /* Limit MP4s to less than 4 GB */
176 m->file = MP4Create( job->file, MP4_DETAILS_ERROR, 0 );
179 if (m->file == MP4_INVALID_FILE_HANDLE)
181 hb_error("muxmp4.c: MP4Create failed!");
187 mux_data = malloc( sizeof( hb_mux_data_t ) );
188 job->mux_data = mux_data;
190 /* When using the standard 90000 timescale, QuickTime tends to have
191 synchronization issues (audio not playing at the correct speed).
192 To workaround this, we use the audio samplerate as the
194 if (!(MP4SetTimeScale( m->file, m->samplerate )))
196 hb_error("muxmp4.c: MP4SetTimeScale failed!");
201 if( job->vcodec == HB_VCODEC_X264 )
203 /* Stolen from mp4creator */
204 MP4SetVideoProfileLevel( m->file, 0x7F );
205 mux_data->track = MP4AddH264VideoTrack( m->file, m->samplerate,
206 MP4_INVALID_DURATION, job->width, job->height,
207 job->config.h264.sps[1], /* AVCProfileIndication */
208 job->config.h264.sps[2], /* profile_compat */
209 job->config.h264.sps[3], /* AVCLevelIndication */
210 3 ); /* 4 bytes length before each NAL unit */
213 MP4AddH264SequenceParameterSet( m->file, mux_data->track,
214 job->config.h264.sps, job->config.h264.sps_length );
215 MP4AddH264PictureParameterSet( m->file, mux_data->track,
216 job->config.h264.pps, job->config.h264.pps_length );
218 if( job->h264_level == 30 || job->ipod_atom)
220 hb_deep_log( 2, "muxmp4: adding iPod atom");
221 MP4AddIPodUUID(m->file, mux_data->track);
224 m->init_delay = job->config.h264.init_delay;
226 else /* FFmpeg or XviD */
228 MP4SetVideoProfileLevel( m->file, MPEG4_SP_L3 );
229 mux_data->track = MP4AddVideoTrack( m->file, m->samplerate,
230 MP4_INVALID_DURATION, job->width, job->height,
231 MP4_MPEG4_VIDEO_TYPE );
232 if (mux_data->track == MP4_INVALID_TRACK_ID)
234 hb_error("muxmp4.c: MP4AddVideoTrack failed!");
240 /* VOL from FFmpeg or XviD */
241 if (!(MP4SetTrackESConfiguration( m->file, mux_data->track,
242 job->config.mpeg4.bytes, job->config.mpeg4.length )))
244 hb_error("muxmp4.c: MP4SetTrackESConfiguration failed!");
250 // COLR atom for color and gamma correction.
252 // http://developer.apple.com/quicktime/icefloe/dispatch019.html#colr
253 // http://forum.doom9.org/showthread.php?t=133982#post1090068
254 // we say anything that's likely to be HD content is ITU BT.709 and
255 // DVD, SD TV & other content is ITU BT.601. We look at the title height
256 // rather than the job height here to get uncropped input dimensions.
257 if ( job->title->height >= 720 )
259 // we guess that 720p or above is ITU BT.709 HD content
260 MP4AddColr(m->file, mux_data->track, 1, 1, 1);
264 // ITU BT.601 DVD or SD TV content
265 MP4AddColr(m->file, mux_data->track, 6, 1, 6);
268 if( job->pixel_ratio )
270 /* PASP atom for anamorphic video */
273 width = job->pixel_aspect_width;
275 height = job->pixel_aspect_height;
277 MP4AddPixelAspectRatio(m->file, mux_data->track, (uint32_t)width, (uint32_t)height);
279 MP4SetTrackFloatProperty(m->file, mux_data->track, "tkhd.width", job->width * (width / height));
282 /* add the audio tracks */
283 for( i = 0; i < hb_list_count( title->list_audio ); i++ )
285 static uint8_t reserved2[16] = {
286 0x00, 0x00, 0x00, 0x00,
287 0x00, 0x00, 0x00, 0x00,
288 0x00, 0x02, 0x00, 0x10,
289 0x00, 0x00, 0x00, 0x00,
292 audio = hb_list_item( title->list_audio, i );
293 mux_data = malloc( sizeof( hb_mux_data_t ) );
294 audio->priv.mux_data = mux_data;
296 if( audio->config.out.codec == HB_ACODEC_AC3 )
298 mux_data->track = MP4AddAC3AudioTrack(
300 m->samplerate, 1536, MP4_MPEG4_AUDIO_TYPE );
301 if (audio->config.out.name == NULL) {
302 MP4SetTrackBytesProperty(
303 m->file, mux_data->track,
305 (const uint8_t*)"Surround", strlen("Surround"));
308 MP4SetTrackBytesProperty(
309 m->file, mux_data->track,
311 (const uint8_t*)(audio->config.out.name),
312 strlen(audio->config.out.name));
315 mux_data->track = MP4AddAudioTrack(
317 m->samplerate, 1024, MP4_MPEG4_AUDIO_TYPE );
318 if (audio->config.out.name == NULL) {
319 MP4SetTrackBytesProperty(
320 m->file, mux_data->track,
322 (const uint8_t*)"Stereo", strlen("Stereo"));
325 MP4SetTrackBytesProperty(
326 m->file, mux_data->track,
328 (const uint8_t*)(audio->config.out.name),
329 strlen(audio->config.out.name));
332 MP4SetAudioProfileLevel( m->file, 0x0F );
333 MP4SetTrackESConfiguration(
334 m->file, mux_data->track,
335 audio->priv.config.aac.bytes, audio->priv.config.aac.length );
337 /* Set the correct number of channels for this track */
338 MP4SetTrackIntegerProperty(m->file, mux_data->track, "mdia.minf.stbl.stsd.mp4a.channels", (uint16_t)HB_AMIXDOWN_GET_DISCRETE_CHANNEL_COUNT(audio->config.out.mixdown));
341 /* Set the language for this track */
342 /* The language is stored as 5-bit text - 0x60 */
343 language_code = audio->config.lang.iso639_2[0] - 0x60; language_code <<= 5;
344 language_code |= audio->config.lang.iso639_2[1] - 0x60; language_code <<= 5;
345 language_code |= audio->config.lang.iso639_2[2] - 0x60;
346 MP4SetTrackIntegerProperty(m->file, mux_data->track, "mdia.mdhd.language", language_code);
348 if( hb_list_count( title->list_audio ) > 1 )
350 /* Set the audio track alternate group */
351 MP4SetTrackIntegerProperty(m->file, mux_data->track, "tkhd.alternate_group", 1);
355 /* Enable the first audio track */
356 MP4SetTrackIntegerProperty(m->file, mux_data->track, "tkhd.flags", (TRACK_ENABLED | TRACK_IN_MOVIE));
359 /* Disable the other audio tracks so QuickTime doesn't play
362 MP4SetTrackIntegerProperty(m->file, mux_data->track, "tkhd.flags", (TRACK_DISABLED | TRACK_IN_MOVIE));
363 hb_deep_log( 2, "muxp4: disabled extra audio track %i", mux_data->track-1);
368 if (job->chapter_markers)
370 /* add a text track for the chapters. We add the 'chap' atom to track
371 one which is usually the video track & should never be disabled.
372 The Quicktime spec says it doesn't matter which media track the
373 chap atom is on but it has to be an enabled track. */
374 MP4TrackId textTrack;
375 textTrack = MP4AddChapterTextTrack(m->file, 1);
377 m->chapter_track = textTrack;
378 m->chapter_duration = 0;
379 m->current_chapter = job->chapter_start;
382 /* Add encoded-by metadata listing version and build date */
384 tool_string = (char *)malloc(80);
385 snprintf( tool_string, 80, "HandBrake %s %i", HB_VERSION, HB_BUILD);
386 MP4SetMetadataTool(m->file, tool_string);
392 static int MP4Mux( hb_mux_object_t * m, hb_mux_data_t * mux_data,
395 hb_job_t * job = m->job;
399 if( mux_data == job->mux_data )
403 // if there are b-frames compute the render offset
404 // (we'll need it for both the video frame & the chapter track)
407 offset = ( buf->start + m->init_delay ) * m->samplerate / 90000 -
410 /* Add the sample before the new frame.
411 It is important that this be calculated prior to the duration
412 of the new video sample, as we want to sync to right after it.
413 (This is because of how durations for text tracks work in QT) */
414 if( job->chapter_markers && buf->new_chap )
416 struct hb_text_sample_s *sample;
418 // this chapter is postioned by writing out the previous chapter.
419 // the duration of the previous chapter is the duration up to but
420 // not including the current frame minus the duration of all
421 // chapters up to the previous.
422 duration = m->sum_dur - m->chapter_duration + offset;
425 /* The initial & final chapters can have very short durations
426 * (less than the error in our total duration estimate) so
427 * the duration calc above can result in a negative number.
428 * when this happens give the chapter a short duration (1/3
429 * of an ntsc frame time). */
430 duration = 1000 * m->samplerate / 90000;
433 sample = MP4GenerateChapterSample( m, duration, buf->new_chap );
435 if( !MP4WriteSample(m->file,
442 hb_error("Failed to write to output file, disk full?");
446 m->current_chapter = buf->new_chap;
447 m->chapter_duration += duration;
450 // since we're changing the sample rate we need to keep track of
451 // the truncation bias so that the audio and video don't go out
452 // of sync. m->sum_dur_in is the sum of the input durations so far.
453 // m->sum_dur is the sum of the output durations. Their difference
454 // (in output sample rate units) is the accumulated truncation bias.
455 int64_t bias = ( m->sum_dur_in * m->samplerate / 90000 ) - m->sum_dur;
456 int64_t dur_in = buf->stop - buf->start;
457 duration = dur_in * m->samplerate / 90000 + bias;
460 /* We got an illegal mp4/h264 duration. This shouldn't
461 be possible and usually indicates a bug in the upstream code.
462 Complain in the hope that someone will go find the bug but
463 try to fix the error so that the file will still be playable. */
464 hb_log("MP4Mux: illegal duration %lld, bias %lld, start %lld (%lld),"
465 "stop %lld (%lld), sum_dur %lld",
466 duration, bias, buf->start * m->samplerate / 90000, buf->start,
467 buf->stop * m->samplerate / 90000, buf->stop, m->sum_dur );
468 /* we don't know when the next frame starts so we can't pick a
469 valid duration for this one so we pick something "short"
470 (roughly 1/3 of an NTSC frame time) and rely on the bias calc
471 for the next frame to correct things (a duration underestimate
472 just results in a large bias on the next frame). */
473 duration = 1000 * m->samplerate / 90000;
475 m->sum_dur += duration;
476 m->sum_dur_in += dur_in;
481 duration = MP4_INVALID_DURATION;
484 // Here's where the sample actually gets muxed.
485 if( !MP4WriteSample( m->file,
491 ((buf->frametype & HB_FRAME_KEY) != 0) ) )
493 hb_error("Failed to write to output file, disk full?");
500 static int MP4End( hb_mux_object_t * m )
502 hb_job_t * job = m->job;
504 /* Write our final chapter marker */
505 if( m->job->chapter_markers )
507 int64_t duration = m->sum_dur - m->chapter_duration;
508 /* The final chapter can have a very short duration - if it's less
509 * than a second just skip it. */
510 if ( duration >= m->samplerate )
513 struct hb_text_sample_s *sample = MP4GenerateChapterSample( m, duration,
514 m->current_chapter + 1 );
515 if( ! MP4WriteSample(m->file, m->chapter_track, sample->sample,
516 sample->length, sample->duration, 0, true) )
518 hb_error("Failed to write to output file, disk full?");
527 // Insert track edit to get A/V back in sync. The edit amount is
529 int64_t edit_amt = m->init_delay * m->samplerate / 90000;
530 MP4AddTrackEdit(m->file, 1, MP4_INVALID_EDIT_ID, edit_amt,
531 MP4GetTrackDuration(m->file, 1), 0);
532 if ( m->job->chapter_markers )
534 // apply same edit to chapter track to keep it in sync with video
535 MP4AddTrackEdit(m->file, m->chapter_track, MP4_INVALID_EDIT_ID,
537 MP4GetTrackDuration(m->file, m->chapter_track), 0);
543 if ( job->mp4_optimize )
545 hb_log( "muxmp4: optimizing file" );
546 char filename[1024]; memset( filename, 0, 1024 );
547 snprintf( filename, 1024, "%s.tmp", job->file );
548 MP4Optimize( job->file, filename, MP4_DETAILS_ERROR );
550 rename( filename, job->file );
556 hb_mux_object_t * hb_mux_mp4_init( hb_job_t * job )
558 hb_mux_object_t * m = calloc( sizeof( hb_mux_object_t ), 1 );